Hedge fund billionaire Ray Dalio is known for his dire warnings about the economy and the national debt, but he just issued one of his starkest warnings to date, likening the United States’ mounting debt crisis to an impending “economic heart attack” and urging policymakers to revisit the fiscal discipline that characterized the 1990s boom years. Dalio’s alarm, sounded in a series of social media posts and interviews, including with Fortune’s Diane Brady, comes as the national debt nears $37 trillion and the federal deficit continues to swell, fueling bipartisan anxieties about the country’s financial health.

Dalio, founder of the world’s largest hedge fund, Bridgewater Associates, described America’s deficit spiral in dramatic—and visceral—terms. “We’re spending 40% more than we’re taking in, and this is a chronic problem,” he said in a recent appearance on Fox Business. “What you’re seeing is the debt service payments … well into squeezing away, so it’s like plaque in the arteries squeezing away buying power.”

The analogy underscores a grim reality: Debt service payments have ballooned as a share of government spending, increasingly crowding out funds for other priorities. Dalio warns the U.S. is near a tipping point where it must issue new debt merely to pay interest on existing obligations—a cycle that he says could trigger not just a financial shock but a systemic breakdown reminiscent of cardiac arrest. We’ve got to go back, he argues—back to the ’90s.